The parents of six children who died after a house fire in Derby have been convicted of their manslaughter, along with their friend.
Mick Philpott and Paul Mosley were found guilty by unanimous verdicts, while Mairead Philpott was convicted by a majority, at Nottingham Crown Court.
The blaze was part of a plan Philpott had to frame his former mistress so he could win custody of his children.
A senior police officer said it was the most tragic case he had worked on.
'Violent and controlling'
Derbyshire Assistant Chief Constable Steve Cotterill said: "There are six little kids there that have not got the chance to grow up.
"Personally I have found it very upsetting. I have become extremely angry at the needless loss of life."
Five of the children died on the morning of the fire in Victory Road, and the sixth died three days later.
Jade Philpott, 10, John, nine, Jack, eight, Jesse, six, and Jayden, five, died on the morning of the fire on 11 May 2012.
Mrs Philpott's son from a previous relationship, 13-year-old Duwayne, died later in hospital.
Jurors heard that Philpott had been violent and controlling towards his former live-in mistress, Lisa Willis.
When she left, taking her children, he became "obsessed with getting Lisa and the kids back".
He started the fire in a bid to frame her for the crime and win custody of the children - and perhaps obtain a bigger house - the prosecution argued.
Jurors were not told that Philpott also had a violent past - he was jailed in 1978 for attempting to murder a 17-year-old ex-girlfriend.
He stabbed her 13 times as she lay sleeping after she ended their relationship, and also attacked her mother when she intervened.
The three defendants were found guilty after less than eight hours of deliberation.
The judge, Mrs Justice Thirlwall, said the defendants would be sentenced on Wednesday.
As the court heard the guilty verdicts, Mairead Philpott looked down at the floor and appeared upset while holding a tissue in her hands.
Before leaving the dock, Mick Philpott was heard to say: "It's not over yet."
In a statement read outside the court, Mick Philpott's sister Dawn Bestwick said: "Our presence in court was to find out the truth and following today's verdict we believe justice has been done.
"This past year has been a very difficult time for our family as we have had to come to terms with what Mick and Mairead and Paul Mosley have done. We can now move on and our six angels can rest in peace."
A statement read on behalf of the Duffy family, the family of Mairead Philpott, said: "Duwayne, Jade, John, Jack, Jesse and Jayden were taken away in the cruellest way imaginable by the very people that were supposed to love and protect them.
"We, Mairead's family, cannot describe the pain we feel. Today justice has been done and we are happy with the verdict."
A serious case review is under way into the children's deaths but is not due to be completed before the summer.
The children were not subject to child protection plans or legal orders, and there have been no urgent recommendations emerging from the review.
When asked if the tragedy could have been foreseen, ACC Cotterill said: "My answer is a very emphatic no. What we are dealing with is the unpredictability of Mick Philpott."